Combined drill, center-reamer, and countersink tool.



F. AfWAGNER.

COMBINED DRILL, CENTER BEAMER, AND OOUNTERSINK TOOL.

APLIOATION FILED MAY 1e. 1910. BBNBWBD DBO. 21, 1911.

110175352. Patented Feb. 13, 1912.

J2' 1J, fjl] I UNITED STATES PATENT oEEIcE.

FREDERIC-K A. WAGNER, OF NORWOOD, OHIO.

COMBINED DRILL,-CENTERREAMR, AND COUNTERSINK TOOL.

Specification of Letters Patent.

` Application led May 16, 1910, Serial No. 561,537. tRenewed December 21, 1911. Serial No. 667,214.

Patented Feb. 13, 1912.

To all 'whom it may concern:

Be it known that I, FREDERICK A. VVAG- NER, a citizen of the United States, residing at Norwood, in the county of Hamilton and State of Ohio,.have invented certain new and useful Improvements in Combined Drill, Center- Beamer, and Countersink Tools, ofwhich the 4following is a specification.

My invention has for its object the providing of a tool combining a drill, center reamer and countersink, in which the cutting edges are located on a separate blade of high speed steel insertible and secured in place in a head in novel manner, and the invention Will be readily understood from the following description and claims, and from the drawing, in which latter:

Figure 1 is a side elevation of my improved device. Fig. 2 is an edge elevation of the same. Fig. 3 is an end elevation of the same. Fig. 4 is an axial section of the same taken on the line z-"e of Fig. 1. Fig. 5 is a perspective view of the blade in separated relation. Fig. 6` is a perspective v1ew of the head in Separated relation. Fig. 7 is a cross-section on the line y-y of Fig. 1.

Fig. 8 is a cross-section on the line v /.v of

Fig. y1. Fig. 9 is a longitudinal section on the line w-w of Fig. 1; and, Fi 10 is a side elevation of a shaft partly bro en away, having its end shownV in central axial section', for exposing the hole formed by my improved device.

1 is a head which is provided with a longitudinal slot 2 extendlng across the longitudinal axis of the head. The head is preferably composed of ordinary steel, such as machinery steel orcold rolled steel, and is a comparatively soft steel.

3 is a flat cutter-blade and comprises a drilling section 3, a center-reaming section 3", and a coimtersinking section 3, each of which is provided with cutting edges, the cutting edges at the respective edges of said Hat cutter-blade merging into each other, and together form Aa combination drilling,

center reaming an counter sinkinv blade.

The blade is a Hat blade and is received in the longitudinal slot 2, preferably with its inner end against the bottomfv of the slots for shouldering the inner ehd of the blade against said bottom. The blade is provided with apertures 4 and 5 through which the clamp-screws 6 and 7 are respectively received and in which said clamp-screws have a snug t for locating said drllling, centerreaming and countersinking blade laterally and in central line with the longitudinal or .rotary axis of the head.

threaded bores 11 in the other of said wings,

the heads 12 of said screws being received in enlarged bores 13 in the wings 8, between which and the bores 10 shoulders 14 are located, against which the heads of the screws exert pressure for pressing the wings toward each other. n

The drilling section 3a'of the blade is provided at the respective sides of its median line and at opposite sides of the blade with end 'cutting-edges 15 and side cuttin -edges 16, these side cutting-edges being pre erably parallel.

At the center-reaming section 3h the blade is provided at the respective sides of its me ian line and at opposite sides of the blade with inclined center-reaming cutting-edges 17 which connect with the side cutting-edges land respectively extend from said respective side-cutting edges at obtuse angles, the

said tapering cutting-edges being however at an acute angle with relation to each other. The counter-sinking section 3 of the cutterblade is provided with end cutting edges 18 at the respective sides' of its median line and at opposite sides of the blade, which are substantially perpendicular to the rotary axis of the cutterhead but recedeslightly rearwardly from said perpendicular line and mer e into said inclined center-reaming cuttlng-edges at an obtuse angle thereto, and in turn merge into inclined cuttin ed es 19 which recede outwardly from sai end cutting-edges 18, preferably at an obtuse angle thereto, these last-named cutting edges being lat the res ective sides of the median line of the blade and at" opposite esl sides of the blade. These cutting edges are arranged in pairs respectively located atthe lateral edges of the cutter-blade for forming a dat cutter-blade which has a pyramldally formed middle'reaming-section merging into a drillin section at its outer end and a counter-sln ing section at its inner end so that when the tool is used it will formL provided in the end of the ieee operated on, instanced as a shaft, whici has aclearance drill at the inner end of its tapered wall, and the outer 'end of the tapered wall of which is distanced from the end of the shaft and counter-sunk therein so as to protect the same against contact with other bodies for preventing nicking or chipping of said center-raam and preserving said center-ream in perfect condition for enabling the same to e used repeatedl without refinishing, the various sections o the hole being formed at one operation for .insuring accuracy in an economical manner.

The respective edges of the blade at their cutting-edge portions are provided with clearance rakes 31 32 shown in the form of grooves extending longitudinally of said cutting-edges and following the angles thereof in the res ective side aces of said blade and exten ing inwardly from said cutting edges toward the rotary axis of the head. The outer ed es of said blade in rear of said cutting e ges are provided with relieving rakes 33 34 which also extend lengthwise of said cutting edges and follow the angles thereof.

The wings are respectively provided with partir-conical ends 35 36 which'are received at the respective sides of the median ta ered center-reaming portion 3b of the cutterlade and roject toward the drilling section 3a of said blade and terminate at their outer ends adjacent the meeting line between said drilling section and center-reaming section, and have shoulders 37 38 at their inner ends adjacent the end cutting-faces 18. The said wings are further provided with particonieal ortions 39 40 between said lastnamed s oulders and the outer walls of said wings.. The parts are so formed that the said cutter-blade at its cutting ed es extends but slightly beyond the portions of the head just mentioned for imparting` l recess 41, the wall of which describes a circle which intersects the said cutting edge adjacent its outer end, and the wall of said recess ad'acent said blade describes a curve on a sma ler circle than the curve described By these means a center-ream, is-

Leif/,eea

by the end of said recess adjacent that portion of the periphery of said head which is perpendicular to the plane of said blade.

l It is referred that thc blade be made of so-calle high-speed steel, and it is readily inserted and relnoved from the slot in thc head for the purposes of renewal. In removing the blade, the clamp-screws 6 7 are removed, and a tapered pin, indicated at 42 in dotted lines in Fig. 4, is inserted into a liole 43 extendin through said head at right angles to the s ot and merging with the inner end of the slot, the tapered pin being arranged to be forced between the inner wall 'of said hole and the inner end of the blad for forcing the blade outwardly.

yA tool of the character described is thus provided in which the cutter-blade is braced b`y supporting metal to the maximum extent and large clearance provided for the chips produced in the cutting operation. The head may be provided with a shank 44 arranged to be inserted in a suitable chuck or other holding device of a machine for operating the same.

Having thus fully described my invention,

what I claim as new and desire to secure by Letters Patent is:

1. A combined drill, center-reamer andcountersink tool comprising in combination a head provided with an end slot located in the axial plane of said head and extending lengthwise of said head from its end for forming a pair of Wings, a cutter-blade having thereon a drilling section, a centerreaming section and a eountersinking section received in said slot, and a clamp-screw received through said blade and clamping said wings toward said blade for clamping the blade in position, substantially as described.

2. A combined drill, center-reamer v and countersink tool comprising in combination, a head provided with an end slot located in the axial lane of said headand extendinglengthwise of said head from its end for forming a pair of wings, a cutter-blade having thereon an end drilling section,a middle center-reaming section and an inner counter-sinkin sect-ion received in said slot,

the said midd e center-reaming section having tapering edges, and a clam -screw received through said blade an clamping said wings toward said blade for clamping said blade in position, the outer ends of said wings being provided withA taperin tions contacting the sides of. the mid le section of said blade, substantially as described. 3. A combined drill, center-reamer and countersinl: tool comprising in combination a head provided with an end slot located in the axial plane of said head and extending lengthwise of said head to a substantial extent from its end `for forming a pair of wings, a Hat cutter-blade having thereon a pori middle tapered center-reaming section, a l provided with clearance rake-grooves at the 20 respective edges of said blade which extend drilling section at the outer' end of the latter, and a counter-sinking section at the inner end of said tapered center-reaming section, said cutter-blade receivedin said slot, and a clamp-screw received through said blade and clamping said blade in position, the said cutter-blade 'being provided at the respective sides of its median line and at 0pposite sides of said blade with end cutting edges 15 and slde cuttin edges 16 at said drilling section, with end-cutting edges 18 at said counter-sinking section, and wlth inclined center-reaming cutting-edges 17 at said center-reamin section Which extend at acute angles wit relation to each other and at obtuse angles with relation to said end-cutting edges 18 and side cutting-edges 16, the respectlve lsides of said blade being longitudinally of said cutting edges and follow the angles thereof, the said wings being provided with clearance vrecesses at said grooves, and the said wings being provided With outer parti-conical ends located at the respective sides of said tapered center-reaming section closely adjacent tof the rear of the cutting edges of said blade, substantially as described.

In testimony whereof, I have signed my name hereto in the presence of two subscribing Witnesses. t

FREDERICK A. WAGNER. 

